802. 11a performance over various channels

A structure formed of semi-rigid material including a set of first form units, of rectangular cross-section, adapted to be secured in end-to-end relation about the margin of a pool with their upper edges being flush with the upper edge of the pool wall, each first form unit having at least two transversely extending plugs capable of receiving nails which are driven therethrough and into the rim of the pool wall; and further including a second set of form units, of rectangular cross-section and of greater width than the first form units so as to project thereabove to provide an edge form for a deck slab poured on the upper edge of the pool wall, the confronting surfaces of the form units being attached by pressure sensitive adhesive strips, whereby the second form units are strippable from the first form units to expose the edge of the deck slab for finishing with an appropriate hand tool.